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Roman Catechism
Proof Of The Obligation

This truth is clearly conveyed by our Lord Himself, when, by a most beautiful metaphor, He calls the power of administering this Sacrament, the key of the kingdom of heaven. Just as no one can enter any place without the help of him who has the keys, so no one is admitted to heaven unless its gates be unlocked by the priests to whose custody the Lord gave the keys. This power would otherwise be of no use in the Church. If heaven can be entered without the power of the keys, in vain would they to whom the keys were given seek to prevent entrance within its portals.

This thought was familiar to the mind of St. Augustine. Let no man, he says, say within himself: “I repent in secret to the Lord. God, who has power to pardon me, knows the inmost sentiments of my heart.,, Was there, then, no reason for saying “whatsoever you loose on earth, shall be loosed in heaven,” no reason why the keys were given to the Church of God? The same doctrine is taught by St. Ambrose in his treatise On Penance, when refuting the heresy of the Novatians who asserted that the power of forgiving sins belonged solely to God.' Who, says he, yields greater reverence to God, he who obeys or he who resists His commands? God commands us to obey His ministers; and by obeying them, we honour God alone.